Makarov's Cube (aka Oskar Mixup / Hedgehog Cube) witch magnets.
forum link: http://twistypuzzles.com/forum/viewtopic.php?f=15&t=20165

The cube was made in 1985 by Sergey Makarov
http://img717.imageshack.us/img717/1453/fileiw.jpg
http://twistypuzzles.com/forum/viewtopic.php?p=170169#p170169
you can see this patent there: http://v3.espacenet.com/publicationDetails/biblio?CC=SU&NR=1191088&KC=&F
and Oskar Van Deventer produced his version
http://www.shapeways.com/model/31732/mixup_cube.html

ADDON ---------------------------------------------------------------------------------------------
You need 40 mm sphere... How to create metal sphere
http://www.youtube.com/watch?v=G95lHeV8ohU

(6+3) * 8 = 72 magnets with 6 x 2 mm size (diameter x width).
Magnets you can find on ebay:
http://shop.ebay.com/i.html?_nkw=magnets+2mm+x+6mm&_sacat=0&_odkw=magnets+2+x+6&_osacat=0&_trksid=p3286.c0.m270.l1313

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1. You purchase DIY Kit (do-it-yourself kit). It’s not an assembled puzzle, but separate details.
2. You also have to buy a set of stickers or cut them by yourself.
http://speedcubing.hu/webshop/index.php?main_page=index& cPath=6_32&zenid=22a47ccc650ae4b483421bf75ef75758
sticker seller: Olivér Nagy - rubikkocka@gmail.com
3. or contact directly if you want to buy a fully dyed, assembled and stickered puzzle.